Handlebar assembly



FIG. 1 is a front elevational view of a handlebar assembly;

FIG. 2 is a right side elevational view thereof;

FIG. 3 is as left side elevational view thereof;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof.

The ornamental design for a handlebar assembly, as shown and described.